Optical lens assembly

1. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is with negative refractive power;

a third lens which is with positive refractive power;

a fourth lens which is with negative refractive power;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to an image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

3≤ f 6 /f≤ 5

wherein f 6 is an effective focal length of the sixth lens and f is an effective focal length of the optical lens assembly.

2. The optical lens assembly as claimed in claim 1 , wherein the fourth lens is a meniscus lens and comprises a concave surface facing the object side and a convex surface facing the image side.

3. The optical lens assembly as claimed in claim 2 , wherein the first lens satisfies:

−1.5≤( R 11 −R 12 )/( R 11 +R 12 )≤−0.5

wherein R 11 is a radius of curvature of the convex surface of the first lens and R 12 is a radius of curvature of an image side surface of the first lens.

4. The optical lens assembly as claimed in claim 1 , wherein the third lens satisfies:

−100≤( R 31 −R 32 )/( R 31 +R 32 )≤2

wherein R 31 is a radius of curvature of an object side surface of the third lens and R 32 is a radius of curvature of an image side surface of the third lens.

5. The optical lens assembly as claimed in claim 1 , wherein the optical lens assembly satisfies:

0.69≤ f/TTL≤ 0.85

wherein f is an effective focal length of the optical lens assembly and TTL is an interval from the convex surface of the first lens to an image plane along the optical axis.

6. The optical lens assembly as claimed in claim 1 , wherein the sixth lens is a meniscus lens and comprises a convex surface facing the object side and a concave surface facing the image side.

7. The optical lens assembly as claimed in claim 1 , wherein the first lens, second lens, third lens, fourth lens, fifth lens and sixth lens further comprising at least one aspheric surface.

8. The optical lens assembly as claimed in claim 1 , further comprising a stop disposed between the object side and the first lens.

9. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is with refractive power;

a third lens which is with refractive power;

a fourth lens which is a meniscus lens with negative refractive power and comprises a concave surface facing the object side and a convex surface facing an image side;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

−1.8≤ f 4 /f≤− 1.3;

3≤ f 6 /f≤ 5

wherein f 4 is an effective focal length of the fourth lens, f 6 is an effective focal length of the sixth lens and f is an effective focal length of the optical lens assembly.

10. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is with refractive power;

a third lens which is with refractive power;

a fourth lens which is a meniscus lens with negative refractive power and comprises a concave surface facing the object side and a convex surface facing an image side;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

3≤ f 6 /f≤ 5

0.2≤( R 21 −R 22 )/( R 21 +R 22 )≤0.4

wherein f 6 is an effective focal length of the sixth lens, f is an effective focal length of the optical lens assembly, R 21 is a radius of curvature of an object side surface of the second lens and R 22 is a radius of curvature of an image side surface of the second lens.

11. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is with refractive power;

a third lens which is with refractive power;

a fourth lens which is with negative refractive power;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to an image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

5≤ f 5 /f≤ 100;

3≤ f 6 /f≤ 5

wherein f 5 is an effective focal length of the fifth lens, f 6 is an effective focal length of the sixth lens and f is an effective focal length of the optical lens assembly.

12. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is a meniscus lens with negative refractive power and comprises a convex surface facing the object side and a concave surface facing an image side;

a third lens which is with refractive power;

a fourth lens which is with negative refractive power;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

3≤ f 6 /f≤ 5

wherein f 6 is an effective focal length of the sixth lens and f is an effective focal length of the optical lens assembly.

13. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is with negative refractive power;

a third lens which is with positive refractive power and comprises a convex surface facing an image side;

a fourth lens which is with negative refractive power;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

3≤ f 6 /f≤ 5

wherein f 6 is an effective focal length of the sixth lens and f is an effective focal length of the optical lens assembly.

14. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is with refractive power;

a third lens which is with refractive power;

a fourth lens which is with negative refractive power;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to an image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

3≤ f 6 /f≤ 5;

65°≤field of view≤75°

wherein f 6 is an effective focal length of the sixth lens and f is an effective focal length of the optical lens assembly.

15. An optical lens assembly comprising:

a first lens which is with positive refractive power and comprises a convex surface facing an object side;

a second lens which is with refractive power;

a third lens which is with refractive power;

a fourth lens which is with negative refractive power;

a fifth lens which is with positive refractive power; and

a sixth lens which is with positive refractive power;

wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to an image side along an optical axis of the optical lens assembly,

wherein the optical lens assembly satisfies:

−100≤( R 31 −R 32 )/( R 31 +R 32 )≤2;

5≤ f 5 /f≤ 100

wherein R 31 is a radius of curvature of an object side surface of the third lens, R 32 is a radius of curvature of an image side surface of the third lens, f 5 is an effective focal length of the fifth lens and f is an effective focal length of the optical lens assembly.

16. The optical lens assembly as claimed in claim 15 , wherein the optical lens assembly satisfies:

−1.8≤ f 4 /f≤− 1.3

wherein f 4 is an effective focal length of the fourth lens and f is an effective focal length of the optical lens assembly.

17. The optical lens assembly as claimed in claim 15 , wherein the optical lens assembly satisfies:

0.69≤ f/TTL≤ 0.85

wherein f is an effective focal length of the optical lens assembly and TTL is an interval from the convex surface of the first lens to an image plane along the optical axis.

18. The optical lens assembly as claimed in claim 15 , wherein a range of field of view satisfies: 65°≤field of view≤75°.